RNMailModule.java

package com.chirag.RNMail;

import android.content.Intent;
import android.content.pm.PackageManager;
import android.content.pm.ResolveInfo;
import android.net.Uri;
import android.text.Html;
import android.support.v4.content.FileProvider;

import com.facebook.react.bridge.ReactApplicationContext;
import com.facebook.react.bridge.ReactContextBaseJavaModule;
import com.facebook.react.bridge.ReactMethod;
import com.facebook.react.bridge.ReadableMap;
import com.facebook.react.bridge.ReadableArray;
import com.facebook.react.bridge.Callback;

import java.util.List;
import java.io.File;

/**
 * NativeModule that allows JS to open emails sending apps chooser.
 */
public class RNMailModule extends ReactContextBaseJavaModule {

  ReactApplicationContext reactContext;

  public RNMailModule(ReactApplicationContext reactContext) {
    super(reactContext);
    this.reactContext = reactContext;
  }

  @Override
  public String getName() {
    return "RNMail";
  }

  /**
    * Converts a ReadableArray to a String array
    *
    * @param r the ReadableArray instance to convert
    *
    * @return array of strings
  */
  private String[] readableArrayToStringArray(ReadableArray r) {
    int length = r.size();
    String[] strArray = new String[length];

    for (int keyIndex = 0; keyIndex < length; keyIndex++) {
      strArray[keyIndex] = r.getString(keyIndex);
    }

    return strArray;
  }

  @ReactMethod
  public void mail(ReadableMap options, Callback callback) {
    Intent i = new Intent(Intent.ACTION_SENDTO);
    i.setData(Uri.parse("mailto:"));

    if (options.hasKey("subject") && !options.isNull("subject")) {
      i.putExtra(Intent.EXTRA_SUBJECT, options.getString("subject"));
    }

    if (options.hasKey("body") && !options.isNull("body")) {
      String body = options.getString("body");
      if (options.hasKey("isHTML") && options.getBoolean("isHTML")) {
        i.putExtra(Intent.EXTRA_TEXT, Html.fromHtml(body));
      } else {
        i.putExtra(Intent.EXTRA_TEXT, body);
      }
    }

    if (options.hasKey("recipients") && !options.isNull("recipients")) {
      ReadableArray recipients = options.getArray("recipients");
      i.putExtra(Intent.EXTRA_EMAIL, readableArrayToStringArray(recipients));
    }

    if (options.hasKey("ccRecipients") && !options.isNull("ccRecipients")) {
      ReadableArray ccRecipients = options.getArray("ccRecipients");
      i.putExtra(Intent.EXTRA_CC, readableArrayToStringArray(ccRecipients));
    }

    if (options.hasKey("bccRecipients") && !options.isNull("bccRecipients")) {
      ReadableArray bccRecipients = options.getArray("bccRecipients");
      i.putExtra(Intent.EXTRA_BCC, readableArrayToStringArray(bccRecipients));
    }

    if (options.hasKey("attachment") && !options.isNull("attachment")) {
      ReadableMap attachment = options.getMap("attachment");
      if (attachment.hasKey("path") && !attachment.isNull("path")) {
        String path = attachment.getString("path");
        File file = new File(path);
        Uri p = FileProvider.getUriForFile(
                reactContext,
                reactContext.getApplicationContext()
                        .getPackageName() + ".provider", file);
        i.putExtra(Intent.EXTRA_STREAM, p);
      }
    }

    PackageManager manager = reactContext.getPackageManager();
    List<ResolveInfo> list = manager.queryIntentActivities(i, 0);

    if (list == null || list.size() == 0) {
      callback.invoke("not_available");
      return;
    }

    if (list.size() == 1) {
      i.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
      try {
        reactContext.startActivity(i);
      } catch (Exception ex) {
        callback.invoke("error");
      }
    } else {
      Intent chooser = Intent.createChooser(i, "Send Mail");
      chooser.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);

      try {
        reactContext.startActivity(chooser);
      } catch (Exception ex) {
        callback.invoke("error");
      }
    }
  }
}